DTE2 _applicationObject reading filename in folder - add-in

Question

below is the current codes i have.
what it does is basically loop thru project solution project file and detect if it is a C# file. however it can't detect files that are put in a folder , how can i modify it to read a C# file in a solution folder.
Regards , Andy
foreach (var projectItem in
_applicationObject.Solution.Projects.Cast<Project>().SelectMany(project => project.ProjectItems.Cast<ProjectItem>()))
{
//for (var i = 0; i < projectItem.FileCount; i++)
//{
if (projectItem.FileCount > 0 && projectItem.Name.EndsWith(".cs")) // check if project is .Cs files
{
string fileName;
try
{
fileName = projectItem.FileNames[0];
}
catch (Exception)
{
continue;
}
//end of find filename
}
}

Answer 1

This will print all items in the solution, I believe.
It works with C++ solution in VS 2012.
// XXX Test
IEnumerator enumerator = m_applicationObject.Solution.GetEnumerator();
string indent = " ";
while (enumerator.MoveNext())
{
Project p = enumerator.Current as Project;
if (p != null)
{
Debug.WriteLine(p.Name);
ProcessProjectItems(p.ProjectItems, indent);
}
}
// XXX Test
void ProcessProjectItems(ProjectItems pis, string indent)
{
if (pis == null)
return;
IEnumerator items = pis.GetEnumerator();
while (items.MoveNext())
{
ProjectItem pi = items.Current as ProjectItem;
if (pi != null)
{
Debug.WriteLine(indent + pi.Name);
if (pi.ProjectItems != null)
{
ProcessProjectItems(pi.ProjectItems, indent + " ");
}
else
{
Project p = pi.Object as Project;
if (p != null && p.ProjectItems != null)
ProcessProjectItems(p.ProjectItems, indent + " ");
}
}
}
}